Firstly, congratulations on your baby! You really need to keep yourself calm, even though this sounds impossible right now. Of course you're upset and you can cry in front of the midwives without them putting you on antidepressants so don't worry about that. I was in pieces when I had to go back into hospital for an infection and I couldn't stop sobbing, the midwives were lovely and told me that I was only upset because of the situation and not because I needed medication. They were right because once I was sorted out medically and allowed home I didn't feel like that anymore. I worried for weeks about my illness returning but it didn't, once I was out of the danger zone I felt loads better. This is what you have to focus on,
You must start putting things into perspective in order to get better, you sound so stressed out and whilst it is totally understandable you need to stop looking at the worst case scenario because it isn't helping you. I really don't mean to sound harsh here, I really don't - but this is one of the things a friend told me and it helped me so much to get out of the panic and distraught state I was in. After a few awful days everything will be ok and you will be back home, I'm so sorry that you're facing this.
Most hospitals will readmit you to the post natal ward which means you can have your baby with you, I wasn't comfortable because of the nature of my illness but my DH could have brought my baby in every day to see me and then left at night with him. So I know it's not ideal but you don't have to be separated from your baby.
Please try to be easier on yourself and your mind, try some relaxation techniques to focus on your health and getting better. I hope you are feeling much better soon, please come and update us to let us know how you are. Soon everything will be back to normal and you'll be at home.